7x7 should be considered a standard small board size instead of 19x19
I seriously think that standard go board sizes should always be a multiple of 6, then plus 1.
So 7x7, 13x13, 19x19, 25x25, 31x31, 37x37. 9x9 completely throws of one of the mathematical balances we got from switching to 19x19, and therefore, 9x9 is just a bad board size. Please use 7x7 instead. Or 1x1 if you have to.
essentially the distance between star points should always be a multiple of three, since it’s the basis of the two-space extension, a sense you’d want beginners to have that’s lost on 9x9. For that reason I’ll teach beginners with 7x7 and 13x13.